Connected: An Internet Encyclopedia
RFC 1122 - 3.2.1.1 Version Number: RFC-791 Section 3.1

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### 3.2.1.1 Version Number: RFC-791 Section 3.1

A datagram whose version number is not 4 MUST be silently discarded.

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Connected: An Internet Encyclopedia
RFC 1122 - 3.2.1.1 Version Number: RFC-791 Section 3.1